package reexec

import "github.com/dotcloud/docker/pkg/reexec"

Package reexec facilitates the busybox style reexec of a binary.

Handlers can be registered with a name and the argv 0 of the exec of the binary will be used to find and execute custom init paths.

It is used in dockerd to work around forking limitations when using Go.

Index ¶

• func Command(args ...string) *exec.Cmd
• func Init() bool
• func Register(name string, initializer func())
• func Self() string

Functions ¶

func Command ¶

func Command(args ...string) *exec.Cmd

Command returns *exec.Cmd with its Path set to the path of the current binary using the result of Self. For example if current binary is "my-binary" at "/usr/bin/" (or "my-binary.exe" at "C:\" on Windows), then cmd.Path is set to "/usr/bin/my-binary" and "C:\my-binary.exe" respectively.

func Init ¶

func Init() bool

Init is called as the first part of the exec process and returns true if an initialization function was called.

func Register ¶

func Register(name string, initializer func())

Register adds an initialization func under the specified name. It panics if the given name is already registered.

func Self ¶

func Self() string

Self returns the path to the current process's binary. On Linux, it returns "/proc/self/exe", which provides the in-memory version of the current binary, whereas on other platforms it attempts to looks up the absolute path for os.Args[0], or otherwise returns os.Args[0] as-is.

Source Files ¶

command_other.go reexec.go